Вот что пишут:
Цитата:
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The "Multiply prepared statement!" message suggests that perhaps you have multiple Threads sharing at the Connection level. It means that from the same Connection, the same PreparedStatement has been requested twice, which you could conceivably do on purpose in a single thread, but probably means you are unadvisedly sharing the Connection between multiple threads who are using the same code to prepare the same Statement.
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http://sourceforge.net/p/c3p0/bugs/7/
Как я понял система вас уведомляет что для одного соединения с БД подготовлено несколько идентичных
prepared statement что есть лишней растратой ресурсов.